Question’s kinda vague. “Travel” as in camping out, or “travel” as in a business trip to Chicago, or “travel” as in a cruise around the tropics? Access to AC/USB for charging? Restrictions as in carrying Li cells? Etc.
In most cases, for me, it’d be the same lights I EDC, maybe even more.
Last time I travelled I took-
Thorfire TG06S (AA NiMh) as bedside light for my wife
Yupard 16340 with RGBW as bedside light for myself
Thorfire C8S to look at things further away
Thorfire TK15S for EDC
Convoy S2+ to compare with TK15S
Nitecore Tube as it is always on my keys
for travelling I’d carry my SC600w HI IV and a Olight UC charger
Probably just whatever i’m EDCing - for the last 3 months it’s been UTorch UT01. Been great so far. Coldish light but I allow that due to its low cost, tiny size, decent UI.
Convoy C8 and a ET D25C Ti. clicky the last time I visited family in L.A…
For T.G. week in Santa Fe, it was a 3Tronics triple and the ET.
Appropriate chargers, as well.
Chris
My travel light is FourSevens Mini 2AA. Small, thin, great runtime, AA, twisty (no tailcap failure), tailstand, Floody,
Size and weight are my major concerns when packing for a trip. To keep those down, I typically bring a light with on-board charging. Usually it’s a TIP CRI, plus an Olight H1R if I expect to need a headlamp.
If I’m going to be spending time in the wilderness, it’s a different story, of course.
Olight S1R, plenty of light for a short trip, bring the USB charger for a longer trip.
https://www.reddit.com/r/flashlight/comments/8gu1pd/why_you_should_always_carry_a_light_a_small_tifu/
He says armytek……
I’d take a Skillhunt h03 , a nichia lumi.tool, a handful of tube lights and a bag o batteries .
My EDC UltraTac K18 with its micro charger unit.
My gray Emisar D4 XP-L HI for showing off.
My TOMO T4 for charging stuff and carrying spare 18650s.
For serious, Caravan or Overseas travel.
A little no name (2 for 3 dollar fifty delivered, specials)
On\OFF Moonlight. AAA. throw away.
Jetbeam Jet 1-MK. 14500
Silver Convoy S2+ 18650
Imalent DN35 26650
2 cell XTR VC2 charger. and a spare cell for each.
Local.
Same charger and extra battery.s
Jetbeam Jet 1. Medium, covers 95% of most things.
Imalent DN35 Cover everything I ever need, over and above.
450\1500 for decent throw\spread. 2200 for extreme.
Once the switches are sorted. It’s probably one of the better all rounders. once you go over a S2 or C8.
That story deserves its own thread.
It's unique (but not very believable in my opinion.)
I like the comment:
"First day with your new p*nis?"
I remember reading that a few days ago! Definitely hard to believe, but a review session for a final? There's a lot I'd do to not miss it.
Anyways, I travel with my Astrolux S41, a Xtar VP2 charger, and a couple LG HG2 cells. The S41 has a great low moonlight mode, more than sufficient higher modes, and a bright turbo. If I'm EDCing it while not traveling, I use 18350 cells in it.
Regular international travel with work, I carry an emisar D4, skilhunt h03 and DQG On my keys. Single 18650 usb charger.
I’m paranoid about losing a light to the airport security Nazis, so only carry lights I can afford to lose.
Convoy S2 
no special one
FW3A
also a photon X on keychain ( 2 2032 cells , very tiny, many modes )
wle
Personally I used Nitecore EC20 for my recent trip to Tanzania (yes, travel industry is alive). I ordered a private tour at altezza and climbed to mount Kilimanjaro with my good old flashlight. Maybe it is not the best flashlight on planet Earth but this gear was in the right place at the right time. That’s why it become my favorite travel flashlight.
Lumintop FW3A + Lumintop HLAAA
I usually have a Rovyvon A5 as a necklace(yeah weird but I prefer it there than with keys), an AAA light in a pocket organizer, and a 18650 light clipped on me somewhere.
Olight S1R (NW, 10C cell). True moon mode, low follows moon, nice beam, small, direct turbo, excellent clip.
If not toyed around with, one charge lasts long enough.
A keychain light (i3E, 4000K, CRI 85) as backup is always with me anyway.